Mounting structure for internal combustion engines

Abstract

To provide a mounting structure of an internal combustion engine which can suppress stress from concentrating on the internal combustion engine due to acceleration and deceleration of a vehicle.SOLUTION: A mounting structure of an internal combustion engine comprises: a first mounting bracket which is fastened with the internal combustion engine at a first fastening position and a second fastening position; and a second mounting bracket which is fixed to a mount attached to a vehicle body where the internal combustion engine is mounted and which is fastened with the internal combustion engine at a third fastening position and a fourth fastening position overlapping with the first mounting bracket where an interval between the third fastening position and the fourth fastening position is larger than an interval between the first fastening position and the second fastening position.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a mounting structure for an internal combustion engine. [Background technology]

[0002] For example, as described in Patent Document 1, a mount device is provided between the engine and the vehicle body in order to reduce engine vibration and noise. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-303916 Summary of the Invention [Problem to be solved by the invention]

[0004] However, depending on the degree of acceleration or deceleration of the vehicle, the G forces acting on the vehicle body may be transmitted to the engine via the mount and mounting bracket, causing stress to be concentrated.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a mounting structure for an internal combustion engine that can suppress the concentration of stress on the internal combustion engine due to acceleration and deceleration of the vehicle. [Means for solving the problem]

[0006] The mounting structure for an internal combustion engine of the present invention comprises a first mounting bracket fastened to the internal combustion engine at a first fastening position and a second fastening position, and a second mounting bracket fixed to a mount attached to a vehicle body on which the internal combustion engine is mounted and fastened so as to overlap the first mounting bracket at a third fastening position and a fourth fastening position that are farther apart from each other than the distance between the first fastening position and the second fastening position.

[0007] beforeThe first mounting bracket has a plate portion provided with the first fastening position and the second fastening position and extending in a predetermined direction, and a pair of columnar fastening portions extending from both ends of the plate portion in the predetermined direction toward the second mounting bracket and fastened to the second mounting bracket. do .

[0008] In the above mounting structure, the second mounting bracket may be fastened to the internal combustion engine at a fifth fastening position and a sixth fastening position that are spaced apart from each other by a distance greater than the distance between the first fastening position and the second fastening position.

[0009] In the above-described mounting structure, the second mounting bracket may have, when viewed from the front of the first mounting bracket and the second mounting bracket along the fastening direction of the second mounting bracket to the first mounting bracket, a substantially rectangular base with the third fastening position, the fourth fastening position, the fifth fastening position, and the sixth fastening position arranged at its four corners, and a fixing portion extending from between the third fastening position and the fourth fastening position and having a tip fixed to the mount.

[0010] In the above mounting structure, the base may have two through-holes that penetrate in the fastening direction and an extension that separates the two through-holes and extends from between the third fastening position and the fourth fastening position to between the fifth fastening position and the sixth fastening position. [Effects of the Invention]

[0011] According to the present invention, it is possible to suppress the concentration of stress on the internal combustion engine due to acceleration and deceleration of the vehicle. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a side view showing an example of an engine mounting structure. [Figure 2] FIG. 2 is a front view showing an example of an engine mounting structure. [Figure 3]FIG. 3 is a top view showing an example of an engine mounting structure. [Figure 4] FIG. 4 is a plan view showing an example of a lower mounting bracket. [Figure 5] FIG. 5 is a plan view showing an example of an upper mounting bracket. [Figure 6] FIG. 6 is a side view showing an example of how an upper mounting bracket is fastened to a lower mounting bracket fastened to an engine. DETAILED DESCRIPTION OF THE INVENTION

[0013] Fig. 1 is a side view showing an example of a mounting structure 8 for an engine 90. Fig. 2 is a front view showing an example of the mounting structure 8 for an engine 90. Fig. 3 is a top view showing an example of the mounting structure 8 for an engine 90. The engine 90 is an example of an internal combustion engine. Figs. 1 to 3 partially show the lower part of the cylinder block of the engine 90.

[0014] The mount structure 8 has a mount 3, a lower mount bracket 1, and an upper mount bracket 2. The mount 3 is made of rubber or the like, and is attached to a vehicle body 91 on which an engine 90 is mounted. The mount 3 reduces vibrations of the engine 90.

[0015] The lower mount bracket 1 is an example of a first mount bracket, and the upper mount bracket 2 is an example of a second mount bracket. The lower mount bracket 1 and the upper mount bracket 2 are formed, for example, from cast iron, and are fastened to the engine 90. A fixing portion 25 of the upper mount bracket 2 is fixed to the mount 3. Note that in FIG. 2, the lower mount bracket 1 is shown by a dotted line for convenience. Furthermore, the fastening portions of the engine 90 to which the lower mount bracket 1 and the upper mount bracket 2 are fastened are formed, for example, from aluminum die-cast.

[0016] In this example, an X direction, a Y direction, and a Z direction that are orthogonal to one another are defined. The X direction is the left-right direction of the vehicle on which the engine 90 is mounted, the Y direction is the front-rear direction of the vehicle, and the Z direction is the up-down direction of the vehicle. The X direction is also the direction in which the lower mounting bracket 1 and the upper mounting bracket 2 are fastened to the engine 90. The lower mounting bracket 1 is fastened directly to the engine 90, and a portion of the upper mounting bracket 2 is fastened to the engine 90 via the lower mounting bracket 1.

[0017] Fig. 4 is a plan view showing an example of the lower mounting bracket 1, and Fig. 5 is a plan view showing an example of the upper mounting bracket 2. Fig. 4 shows the front in the fastening direction, the bottom surface in the up-down direction, and the right side surface in the left-right direction of the lower mounting bracket 1. The lower mounting bracket 1 has a substantially rectangular plate portion 10 with its long side in the Y direction, and columnar fastening portions 11 and 12 extending from both ends of the plate portion 10 in the Y direction.

[0018] The plate portion 10 extends in the front-rear direction. A pair of fastening holes 101, 102 for fastening to the engine 90 are provided side by side in the front-rear direction in the center of the plate portion 10. The fastening holes 101, 102 are formed to threadably engage with bolts Bc, and as shown in FIG. 3 , the lower mounting bracket 1 is fastened to the engine 90 at the fastening holes 101, 102. At this time, the plate surface of the plate portion 10 is in contact with and faces the surface of the engine 90. The positions of the pair of fastening holes 101, 102 on the lower mounting bracket 1 are examples of a first fastening position and a second fastening position, respectively.

[0019] The fastening portions 11, 12 have a generally cylindrical shape extending toward the upper mounting bracket 2, and are provided with holes therein for threading with bolts Bs. The fastening portions 11, 12 protrude from the plate surface of the plate portion 10 in the left-right direction. The fastening portions 11, 12 are fastened to the upper mounting bracket 2 by bolts Bs. As shown in FIG. 2 , the fastening holes 101, 102 are provided between the fastening portions 11, 12 when viewed from the front in the fastening direction. Specifically, the fastening holes 101, 102 are arranged so as to be aligned substantially linearly with the fastening portions 11, 12 in the front-rear direction.

[0020] Fig. 5 is a plan view showing an example of the upper mounting bracket 2. Fig. 5 shows the front in the fastening direction, the bottom in the up-down direction, and the right side in the left-right direction of the upper mounting bracket 2. The upper mounting bracket 2 has a base 20 that is substantially rectangular in front view, and a fixing portion 25 extending from the upper end of the base 20. Four fastening portions 21 to 24 are provided at the four corners of the base 20. Fastening portion 21 is adjacent to fastening portions 23, 22, and fastening portion 24 is adjacent to fastening portions 22, 23. Fastening portions 21, 23 are fastened to fastening portions 11, 12 of the lower mounting bracket 1, and fastening portions 22, 24 are fastened to the engine 90.

[0021] The fastening portions 21, 23 have a generally cylindrical shape and are provided with holes therein that thread with bolts Bs. The upper mount bracket 2 is fastened to the lower mount bracket 1 at the fastening portions 21, 23 with the bolts Bs. When viewed from the front in the fastening direction, the fastening portions 21, 23 overlap with the fastening portions 11, 12 of the lower mount bracket 1, and the bolts Bs pass through the fastening portions 21, 23 and thread into the fastening portions 11, 12, respectively. Note that the positions of the fastening portions 21, 23 on the upper mount bracket 2 are examples of the third and fourth fastening positions, respectively.

[0022] The fastening portions 22, 24 have a generally cylindrical shape and are provided with holes therein that screw into the bolts Ba. The upper mount bracket 2 is directly fastened to the engine 90 at the fastening portions 22, 24 by the bolts Ba. Note that the positions of the fastening portions 22, 24 on the upper mount bracket 2 are examples of the fifth and sixth fastening positions, respectively.

[0023] In the left-right direction, fastening portions 21 and 23 are farther from the surface of engine 90 than fastening portions 22 and 24 by the height of fastening portions 11 and 12 of lower mounting bracket 1. For this reason, base 20 is curved from one side on the fastening portions 22 and 24 side to the other side on the fastening portions 21 and 23 side so as to move away from the surface of engine 90.

[0024] Furthermore, through-holes 201 and 202 are provided at the center of base 20, penetrating in the fastening direction. For example, through-holes 201 and 202 each have a substantially trapezoidal shape, and are formed so that their lower bases face each other. Through-holes 201 and 202 are separated by extension 200. Extension 200 extends from between fastening portions 21 and 23 to between fastening portions 22 and 24. When viewed from the front in the fastening direction, extension 200 is provided along the vertical direction.

[0025] The fixing portion 25 extends obliquely from between the fastening portions 22, 24 with respect to the surface of the engine 90. The fixing portion 25 is a plate-like member formed so that its width in the left-right direction narrows toward its tip. A fastening portion 250 for fastening to the mount 3 is provided at the tip of the fixing portion 25. The fastening portion 250 has a hole into which the bolt Bm screws.

[0026] 6 is a side view showing an example of how the upper mounting bracket 2 is fastened to the lower mounting bracket 1 fastened to the engine 90. First, the lower mounting bracket 1 is fastened to the engine 90 by the bolts Bc in the fastening holes 101, 102.

[0027] Next, the upper mount bracket 2 is fastened to the engine 90 from above the lower mount bracket 1. The upper fastening portion 21 (23) is fastened to the fastening portion 11 (12) of the lower mount bracket 1 with a bolt Bs. The lower fastening portion 22 (24) is fastened to the engine 90 with a bolt Ba. In this way, the upper mount bracket 2 is fastened to the engine 90 with its upper region overlapping the lower mount bracket 1.

[0028] 3, the distance D2 between the fastening portions 21, 23 in the front-to-rear direction of the upper mounting bracket 2 is wider than the distance D1 between the fastening holes 101, 102 in the front-to-rear direction of the lower mounting bracket 1. In other words, the fastening positions of the fastening portions 21, 23 are farther apart from each other than the distance D1 between the fastening positions of the fastening holes 101, 102.

[0029] Therefore, when G forces are applied to the vehicle body 91 due to acceleration or deceleration of the vehicle, the lower mount bracket 1 and the upper mount bracket 2 are more likely to bend in the front-to-rear direction than when the engine 90 and the mount 3 are connected only by the lower mount bracket 1, reducing G forces. This reduces the concentration of stress on the engine 90.

[0030] The lower mount bracket 1 has a plate portion 10 and substantially circular fastening portions 11 and 12. The plate portion 10 extends in the front-rear direction, and the fastening portions 11 and 12 extend from both ends of the plate portion 10 toward the upper mount bracket 2 and are fastened to the upper mount bracket 2. As a result, the fastening portions 11 and 12 flex on both sides of the plate portion 10 extending in the front-rear direction, thereby absorbing the G forces of the vehicle body 91. The shape of the fastening portions 11 and 12 is not limited to a substantially circular shape and may be a rectangular column shape. The length of the fastening portions 11 and 12 in the left-right direction is determined appropriately depending on the design of the engine 90, the mount 3, and the like. Furthermore, the distance D1 between the fastening holes 101 and 102 can be narrower than the distance D2 between the fastening portions 11 and 12, so the lower mount bracket 1 can be easily fastened to the engine 90 even in a small engine 90 with a narrow fastening area, such as a three-cylinder engine 90.

[0031] Furthermore, the upper mount bracket 2 is fastened to the engine 90 at fastening portions 22, 24 that are spaced apart from each other by the distance D1 between the fastening holes 101, 102 of the lower mount bracket 1. In other words, the distance D3 between the fastening portions 22, 24 shown in Fig. 2 is wider than the distance D1 between the fastening holes 101, 102. Therefore, compared to when the upper mount bracket 2 is fastened only by the fastening portions 21, 23, the upper mount bracket 2 is fastened to the engine 90 more stably, and flexing of the upper mount bracket 2 is also stabilized.

[0032] The upper mount bracket 2 also has a base 20 and a fixing portion 25. When viewed from the front along the fastening direction to the lower mount bracket 1, the base 20 has a generally rectangular shape with the fastening portions 21 to 24 located at its four corners. The fixing portion 25 extends from between the fastening portions 21 and 23, and its tip is fixed to the mount 3. Therefore, compared to when the fixing portion 25 extends from another portion, the G force of the vehicle body 91 is more easily transmitted from the mount 3 to the fastening portions 21 and 23, and the bending of the upper mount bracket 2 and the lower mount bracket 1 makes it easier to alleviate stress.

[0033] Furthermore, base 20 has through-holes 201, 202 and extension 200. Through-holes 201, 202 penetrate in the fastening direction. Extension 200 separates through-holes 201, 202 and extends from between fastening portions 21, 23 to between fastening portions 22, 24. Therefore, compared to a case without through-holes 201, 202 and extension 200, upper mounting bracket 2 is lighter and more flexible.

[0034] The above-described embodiment is a preferred example of the present invention, but the present invention is not limited to this and can be modified in various ways without departing from the spirit of the present invention. [Explanation of symbols]

[0035] 1 Lower Mounting Bracket (First Mounting Bracket) 2 Upper mounting bracket (second mounting bracket) 3 Mount 10 Board part 11,12 Fastening part 20 base 21~24 Fastening section 25 Fixed part 91 Body 90 Engine (internal combustion engine) 200 Stretching section 201, 202 Penetration

Claims

1. a first mount bracket fastened to the internal combustion engine at a first fastening position and a second fastening position; a second mount bracket that is fixed to a mount that is attached to a vehicle body on which the internal combustion engine is mounted, and that is fastened to overlap the first mount bracket at a third fastening position and a fourth fastening position that are spaced apart from each other by a distance greater than the distance between the first fastening position and the second fastening position; The first mounting bracket is a plate portion provided with the first fastening position and the second fastening position and extending in a predetermined direction; a pair of columnar fastening portions extending from both ends of the plate portion in the predetermined direction toward the second mount bracket and fastened to the second mount bracket; Mounting structure for internal combustion engines.

2. the second mount bracket is fastened to the internal combustion engine at a fifth fastening position and a sixth fastening position that are spaced apart from each other by a distance greater than the distance between the first fastening position and the second fastening position; 2. The mounting structure for an internal combustion engine according to claim 1.

3. The second mounting bracket is a substantially rectangular base portion having the third fastening position, the fourth fastening position, the fifth fastening position, and the sixth fastening position disposed at four corners thereof when viewed from the front of the first mount bracket and the second mount bracket along the fastening direction of the second mount bracket to the first mount bracket; a fixing portion extending from between the third fastening position and the fourth fastening position, the tip of which is fixed to the mount; 3. The mounting structure for an internal combustion engine according to claim 2.

4. The base portion has two through-holes penetrating in the fastening direction and an extension portion separating the two through-holes and extending from between the third fastening position and the fourth fastening position to between the fifth fastening position and the sixth fastening position.

4. The mounting structure for an internal combustion engine according to claim 3.

5. a first mount bracket fastened to the internal combustion engine at a first fastening position and a second fastening position; a second mount bracket that is fixed to a mount that is attached to a vehicle body on which the internal combustion engine is mounted, and that is fastened to overlap the first mount bracket at a third fastening position and a fourth fastening position that are spaced apart from each other by a distance greater than the distance between the first fastening position and the second fastening position; the second mount bracket is fastened to the internal combustion engine at a fifth fastening position and a sixth fastening position that are spaced apart from each other by a distance greater than the distance between the first fastening position and the second fastening position; Mounting structure for internal combustion engines.

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